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openssl/crypto/rsa/rsa_pmeth.c
Sebastian Andrzej Siewior cac19d19e7 rsa: Do not allow less than 512 bit RSA keys 
As per documentation, the RSA keys should not be smaller than 64bit (the
documentation mentions something about a quirk in the prime generation
algorithm). I am adding check into the code which used to be 16 for some
reason.
My primary motivation is to get rid of the last sentence in the
documentation which suggest that typical keys have 1024 bits (instead
updating it to the now default 2048).
I *assume* that keys less than the 2048 bits (say 512) are used for
education purposes.
The 512 bits as the minimum have been suggested by Bernd Edlinger.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4547)
2017-12-11 12:53:07 +01:00

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/*
* Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/x509v3.h>
#include <openssl/cms.h>
#include "internal/evp_int.h"
#include "rsa_locl.h"
/* RSA pkey context structure */
typedef struct {
/* Key gen parameters */
int nbits;
BIGNUM *pub_exp;
int primes;
/* Keygen callback info */
int gentmp[2];
/* RSA padding mode */
int pad_mode;
/* message digest */
const EVP_MD *md;
/* message digest for MGF1 */
const EVP_MD *mgf1md;
/* PSS salt length */
int saltlen;
/* Minimum salt length or -1 if no PSS parameter restriction */
int min_saltlen;
/* Temp buffer */
unsigned char *tbuf;
/* OAEP label */
unsigned char *oaep_label;
size_t oaep_labellen;
} RSA_PKEY_CTX;
/* True if PSS parameters are restricted */
#define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
if (rctx == NULL)
return 0;
rctx->nbits = 1024;
rctx->primes = RSA_DEFAULT_PRIME_NUM;
if (pkey_ctx_is_pss(ctx))
rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
else
rctx->pad_mode = RSA_PKCS1_PADDING;
/* Maximum for sign, auto for verify */
rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
rctx->min_saltlen = -1;
ctx->data = rctx;
ctx->keygen_info = rctx->gentmp;
ctx->keygen_info_count = 2;
return 1;
}
static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
RSA_PKEY_CTX *dctx, *sctx;
if (!pkey_rsa_init(dst))
return 0;
sctx = src->data;
dctx = dst->data;
dctx->nbits = sctx->nbits;
if (sctx->pub_exp) {
dctx->pub_exp = BN_dup(sctx->pub_exp);
if (!dctx->pub_exp)
return 0;
}
dctx->pad_mode = sctx->pad_mode;
dctx->md = sctx->md;
dctx->mgf1md = sctx->mgf1md;
if (sctx->oaep_label) {
OPENSSL_free(dctx->oaep_label);
dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
if (!dctx->oaep_label)
return 0;
dctx->oaep_labellen = sctx->oaep_labellen;
}
return 1;
}
static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
{
if (ctx->tbuf != NULL)
return 1;
ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
if (ctx->tbuf == NULL)
return 0;
return 1;
}
static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx) {
BN_free(rctx->pub_exp);
OPENSSL_free(rctx->tbuf);
OPENSSL_free(rctx->oaep_label);
OPENSSL_free(rctx);
}
}
static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
size_t *siglen, const unsigned char *tbs,
size_t tbslen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
if (rctx->md) {
if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
return -1;
}
if (EVP_MD_type(rctx->md) == NID_mdc2) {
unsigned int sltmp;
if (rctx->pad_mode != RSA_PKCS1_PADDING)
return -1;
ret = RSA_sign_ASN1_OCTET_STRING(0,
tbs, tbslen, sig, &sltmp, rsa);
if (ret <= 0)
return ret;
ret = sltmp;
} else if (rctx->pad_mode == RSA_X931_PADDING) {
if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
return -1;
}
if (!setup_tbuf(rctx, ctx)) {
RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
return -1;
}
memcpy(rctx->tbuf, tbs, tbslen);
rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
sig, rsa, RSA_X931_PADDING);
} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
unsigned int sltmp;
ret = RSA_sign(EVP_MD_type(rctx->md),
tbs, tbslen, sig, &sltmp, rsa);
if (ret <= 0)
return ret;
ret = sltmp;
} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
if (!setup_tbuf(rctx, ctx))
return -1;
if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
rctx->tbuf, tbs,
rctx->md, rctx->mgf1md,
rctx->saltlen))
return -1;
ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
sig, rsa, RSA_NO_PADDING);
} else {
return -1;
}
} else {
ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
rctx->pad_mode);
}
if (ret < 0)
return ret;
*siglen = ret;
return 1;
}
static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
unsigned char *rout, size_t *routlen,
const unsigned char *sig, size_t siglen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx->md) {
if (rctx->pad_mode == RSA_X931_PADDING) {
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_public_decrypt(siglen, sig,
rctx->tbuf, ctx->pkey->pkey.rsa,
RSA_X931_PADDING);
if (ret < 1)
return 0;
ret--;
if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
RSA_R_ALGORITHM_MISMATCH);
return 0;
}
if (ret != EVP_MD_size(rctx->md)) {
RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
RSA_R_INVALID_DIGEST_LENGTH);
return 0;
}
if (rout)
memcpy(rout, rctx->tbuf, ret);
} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
size_t sltmp;
ret = int_rsa_verify(EVP_MD_type(rctx->md),
NULL, 0, rout, &sltmp,
sig, siglen, ctx->pkey->pkey.rsa);
if (ret <= 0)
return 0;
ret = sltmp;
} else {
return -1;
}
} else {
ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
rctx->pad_mode);
}
if (ret < 0)
return ret;
*routlen = ret;
return 1;
}
static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
size_t rslen;
if (rctx->md) {
if (rctx->pad_mode == RSA_PKCS1_PADDING)
return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
sig, siglen, rsa);
if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
return -1;
}
if (rctx->pad_mode == RSA_X931_PADDING) {
if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
return 0;
} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
int ret;
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
rsa, RSA_NO_PADDING);
if (ret <= 0)
return 0;
ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
rctx->md, rctx->mgf1md,
rctx->tbuf, rctx->saltlen);
if (ret <= 0)
return 0;
return 1;
} else {
return -1;
}
} else {
if (!setup_tbuf(rctx, ctx))
return -1;
rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
rsa, rctx->pad_mode);
if (rslen == 0)
return 0;
}
if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
return 0;
return 1;
}
static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
int klen = RSA_size(ctx->pkey->pkey.rsa);
if (!setup_tbuf(rctx, ctx))
return -1;
if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
in, inlen,
rctx->oaep_label,
rctx->oaep_labellen,
rctx->md, rctx->mgf1md))
return -1;
ret = RSA_public_encrypt(klen, rctx->tbuf, out,
ctx->pkey->pkey.rsa, RSA_NO_PADDING);
} else {
ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
rctx->pad_mode);
}
if (ret < 0)
return ret;
*outlen = ret;
return 1;
}
static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
ctx->pkey->pkey.rsa, RSA_NO_PADDING);
if (ret <= 0)
return ret;
ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
ret, ret,
rctx->oaep_label,
rctx->oaep_labellen,
rctx->md, rctx->mgf1md);
} else {
ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
rctx->pad_mode);
}
if (ret < 0)
return ret;
*outlen = ret;
return 1;
}
static int check_padding_md(const EVP_MD *md, int padding)
{
int mdnid;
if (!md)
return 1;
mdnid = EVP_MD_type(md);
if (padding == RSA_NO_PADDING) {
RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
return 0;
}
if (padding == RSA_X931_PADDING) {
if (RSA_X931_hash_id(mdnid) == -1) {
RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
return 0;
}
} else {
switch(mdnid) {
/* List of all supported RSA digests */
case NID_sha1:
case NID_sha224:
case NID_sha256:
case NID_sha384:
case NID_sha512:
case NID_md5:
case NID_md5_sha1:
case NID_md2:
case NID_md4:
case NID_mdc2:
case NID_ripemd160:
case NID_sha3_224:
case NID_sha3_256:
case NID_sha3_384:
case NID_sha3_512:
return 1;
default:
RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
return 0;
}
}
return 1;
}
static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
RSA_PKEY_CTX *rctx = ctx->data;
switch (type) {
case EVP_PKEY_CTRL_RSA_PADDING:
if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
if (!check_padding_md(rctx->md, p1))
return 0;
if (p1 == RSA_PKCS1_PSS_PADDING) {
if (!(ctx->operation &
(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
} else if (pkey_ctx_is_pss(ctx)) {
goto bad_pad;
}
if (p1 == RSA_PKCS1_OAEP_PADDING) {
if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
}
rctx->pad_mode = p1;
return 1;
}
bad_pad:
RSAerr(RSA_F_PKEY_RSA_CTRL,
RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return -2;
case EVP_PKEY_CTRL_GET_RSA_PADDING:
*(int *)p2 = rctx->pad_mode;
return 1;
case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
*(int *)p2 = rctx->saltlen;
} else {
if (p1 < RSA_PSS_SALTLEN_MAX)
return -2;
if (rsa_pss_restricted(rctx)) {
if (p1 == RSA_PSS_SALTLEN_AUTO
&& ctx->operation == EVP_PKEY_OP_VERIFY) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
return -2;
}
if ((p1 == RSA_PSS_SALTLEN_DIGEST
&& rctx->min_saltlen > EVP_MD_size(rctx->md))
|| (p1 >= 0 && p1 < rctx->min_saltlen)) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
return 0;
}
}
rctx->saltlen = p1;
}
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
if (p1 < RSA_MIN_MODULUS_BITS) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
return -2;
}
rctx->nbits = p1;
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
return -2;
}
BN_free(rctx->pub_exp);
rctx->pub_exp = p2;
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
return -2;
}
rctx->primes = p1;
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_MD:
case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
*(const EVP_MD **)p2 = rctx->md;
else
rctx->md = p2;
return 1;
case EVP_PKEY_CTRL_MD:
if (!check_padding_md(p2, rctx->pad_mode))
return 0;
if (rsa_pss_restricted(rctx)) {
if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
return 1;
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
return 0;
}
rctx->md = p2;
return 1;
case EVP_PKEY_CTRL_GET_MD:
*(const EVP_MD **)p2 = rctx->md;
return 1;
case EVP_PKEY_CTRL_RSA_MGF1_MD:
case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
&& rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
if (rctx->mgf1md)
*(const EVP_MD **)p2 = rctx->mgf1md;
else
*(const EVP_MD **)p2 = rctx->md;
} else {
if (rsa_pss_restricted(rctx)) {
if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
return 1;
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
return 0;
}
rctx->mgf1md = p2;
}
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
return -2;
}
OPENSSL_free(rctx->oaep_label);
if (p2 && p1 > 0) {
rctx->oaep_label = p2;
rctx->oaep_labellen = p1;
} else {
rctx->oaep_label = NULL;
rctx->oaep_labellen = 0;
}
return 1;
case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
return -2;
}
*(unsigned char **)p2 = rctx->oaep_label;
return rctx->oaep_labellen;
case EVP_PKEY_CTRL_DIGESTINIT:
case EVP_PKEY_CTRL_PKCS7_SIGN:
#ifndef OPENSSL_NO_CMS
case EVP_PKEY_CTRL_CMS_SIGN:
#endif
return 1;
case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
case EVP_PKEY_CTRL_PKCS7_DECRYPT:
#ifndef OPENSSL_NO_CMS
case EVP_PKEY_CTRL_CMS_DECRYPT:
case EVP_PKEY_CTRL_CMS_ENCRYPT:
#endif
if (!pkey_ctx_is_pss(ctx))
return 1;
/* fall through */
case EVP_PKEY_CTRL_PEER_KEY:
RSAerr(RSA_F_PKEY_RSA_CTRL,
RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
default:
return -2;
}
}
static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (value == NULL) {
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
return 0;
}
if (strcmp(type, "rsa_padding_mode") == 0) {
int pm;
if (strcmp(value, "pkcs1") == 0) {
pm = RSA_PKCS1_PADDING;
} else if (strcmp(value, "sslv23") == 0) {
pm = RSA_SSLV23_PADDING;
} else if (strcmp(value, "none") == 0) {
pm = RSA_NO_PADDING;
} else if (strcmp(value, "oeap") == 0) {
pm = RSA_PKCS1_OAEP_PADDING;
} else if (strcmp(value, "oaep") == 0) {
pm = RSA_PKCS1_OAEP_PADDING;
} else if (strcmp(value, "x931") == 0) {
pm = RSA_X931_PADDING;
} else if (strcmp(value, "pss") == 0) {
pm = RSA_PKCS1_PSS_PADDING;
} else {
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
return -2;
}
return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
}
if (strcmp(type, "rsa_pss_saltlen") == 0) {
int saltlen;
if (!strcmp(value, "digest"))
saltlen = RSA_PSS_SALTLEN_DIGEST;
else if (!strcmp(value, "max"))
saltlen = RSA_PSS_SALTLEN_MAX;
else if (!strcmp(value, "auto"))
saltlen = RSA_PSS_SALTLEN_AUTO;
else
saltlen = atoi(value);
return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
}
if (strcmp(type, "rsa_keygen_bits") == 0) {
int nbits = atoi(value);
return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
}
if (strcmp(type, "rsa_keygen_pubexp") == 0) {
int ret;
BIGNUM *pubexp = NULL;
if (!BN_asc2bn(&pubexp, value))
return 0;
ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
if (ret <= 0)
BN_free(pubexp);
return ret;
}
if (strcmp(type, "rsa_keygen_primes") == 0) {
int nprimes = atoi(value);
return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
}
if (strcmp(type, "rsa_mgf1_md") == 0)
return EVP_PKEY_CTX_md(ctx,
EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_MGF1_MD, value);
if (pkey_ctx_is_pss(ctx)) {
if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_RSA_MGF1_MD, value);
if (strcmp(type, "rsa_pss_keygen_md") == 0)
return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_MD, value);
if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
int saltlen = atoi(value);
return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
}
}
if (strcmp(type, "rsa_oaep_md") == 0)
return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_OAEP_MD, value);
if (strcmp(type, "rsa_oaep_label") == 0) {
unsigned char *lab;
long lablen;
int ret;
lab = OPENSSL_hexstr2buf(value, &lablen);
if (!lab)
return 0;
ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
if (ret <= 0)
OPENSSL_free(lab);
return ret;
}
return -2;
}
/* Set PSS parameters when generating a key, if necessary */
static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = ctx->data;
if (!pkey_ctx_is_pss(ctx))
return 1;
/* If all parameters are default values don't set pss */
if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
return 1;
rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
rctx->saltlen == -2 ? 0 : rctx->saltlen);
if (rsa->pss == NULL)
return 0;
return 1;
}
static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
RSA *rsa = NULL;
RSA_PKEY_CTX *rctx = ctx->data;
BN_GENCB *pcb;
int ret;
if (rctx->pub_exp == NULL) {
rctx->pub_exp = BN_new();
if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
return 0;
}
rsa = RSA_new();
if (rsa == NULL)
return 0;
if (ctx->pkey_gencb) {
pcb = BN_GENCB_new();
if (pcb == NULL) {
RSA_free(rsa);
return 0;
}
evp_pkey_set_cb_translate(pcb, ctx);
} else {
pcb = NULL;
}
ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
rctx->pub_exp, pcb);
BN_GENCB_free(pcb);
if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
RSA_free(rsa);
return 0;
}
if (ret > 0)
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
else
RSA_free(rsa);
return ret;
}
const EVP_PKEY_METHOD rsa_pkey_meth = {
EVP_PKEY_RSA,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_rsa_init,
pkey_rsa_copy,
pkey_rsa_cleanup,
0, 0,
0,
pkey_rsa_keygen,
0,
pkey_rsa_sign,
0,
pkey_rsa_verify,
0,
pkey_rsa_verifyrecover,
0, 0, 0, 0,
0,
pkey_rsa_encrypt,
0,
pkey_rsa_decrypt,
0, 0,
pkey_rsa_ctrl,
pkey_rsa_ctrl_str
};
/*
* Called for PSS sign or verify initialisation: checks PSS parameter
* sanity and sets any restrictions on key usage.
*/
static int pkey_pss_init(EVP_PKEY_CTX *ctx)
{
RSA *rsa;
RSA_PKEY_CTX *rctx = ctx->data;
const EVP_MD *md;
const EVP_MD *mgf1md;
int min_saltlen, max_saltlen;
/* Should never happen */
if (!pkey_ctx_is_pss(ctx))
return 0;
rsa = ctx->pkey->pkey.rsa;
/* If no restrictions just return */
if (rsa->pss == NULL)
return 1;
/* Get and check parameters */
if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
return 0;
/* See if minimum salt length exceeds maximum possible */
max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
if ((RSA_bits(rsa) & 0x7) == 1)
max_saltlen--;
if (min_saltlen > max_saltlen) {
RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
return 0;
}
rctx->min_saltlen = min_saltlen;
/*
* Set PSS restrictions as defaults: we can then block any attempt to
* use invalid values in pkey_rsa_ctrl
*/
rctx->md = md;
rctx->mgf1md = mgf1md;
rctx->saltlen = min_saltlen;
return 1;
}
const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
EVP_PKEY_RSA_PSS,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_rsa_init,
pkey_rsa_copy,
pkey_rsa_cleanup,
0, 0,
0,
pkey_rsa_keygen,
pkey_pss_init,
pkey_rsa_sign,
pkey_pss_init,
pkey_rsa_verify,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pkey_rsa_ctrl,
pkey_rsa_ctrl_str
};
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